Animation codec clamping

[Nicholas Raeburn]

PS plaese don’t ask me to search the archives beacuse I have, and I still can’t seem to solve the issue.

[Graeme Nattress]

Your DV is YCbCr, and can contain levels from 0% to ~109%. These values are NOT IRE values though, they’re FCP’s internal system of values. See https://www.kenstone.net/fcp_homepage/video_levels_nattress.html

FCP always clamps >100% YCbCr values upon RGB export. That’s how it works. I’d try taking the DV direct to AE and see if that gives you any YCbCr to RGB mapping options, or preserves super-whites.

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Nicholas Raeburn]

So thats how FCP works I did not know if i was doing anything wrong upon export using the animation codec.

Thanks I read that article however I noticed this

[Graeme Nattress]

Sounds like it’s time to do an experiment! Please tell me how you get on!

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Nicholas Raeburn]

Again thankyou for the reply Graham. I can’t test this out know as im on another computer. But will try exporting using YUV and RGB codecs to see the difference (at a guess i would say that FCP is keeping the signal within a 16-235 range on export to animation RGB codec). However this contradicts what your saying in your article that FCP only affects still image import and export and not video rendering (import/export). But i’ll give it a go and report back.

Cheers

Nicholas Raeburn
Organic Productions

[Graeme Nattress]

I think my article is right, but perhaps I should have made a distinction between RGB video and YCbCr video. I don’t have the time now to investigate further though.

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Bret Williams]

SuperWhite doesn’t affect rendering. Just things created in FCP. If you’re in super white mode and you create a white slug, it’ll be 110 white to match the possible super whites of your camera footage. Ditto goes with white of your text, white flashes, etc.

It’s stupid and shouldn’t even be an option. Especially it it’s cutting it off on export.

Why would you be exporting to the Animation codec? I can’t think of a reason but there must be one.

[Nicholas Raeburn]

I’m exporting to Animation to preserve alpha channel information and to stop recompression introduced by going back to theDV codec, to export to AE to do compositing work. Any reason I shouldn’t be.

[Graeme Nattress]

AH, you don’t need to do that. Export DV to AE, export Animation out of AE to go back to FCP!

Graeme

– http://www.nattress.com – Film Effects and Standards Conversion for FCP

[Nicholas Raeburn]

Export DV as a reference movie or recompress?, I thought this would reintroduce compression. I’m sure I can’t preserve alpha channels on keyed subjects this way though.